Johnson Controls YVAHP072B31S, Service Manual

Page: 1090 / 1796

6. 2WKHU,QGLFDWRUV
6.1 In Normal Conditions
6.1.2 Thermo-controller
The fan speed is changed to “LOW ” at the
thermo-controller switch. However, the graphic
indication remains unchanged. (Only in the
heating operation mode.)
6.1.3 Defrost
‡'HIURVW2SHUDWLRQ
7KH³‡´LVWXUQHG21GXULQJWKHGHIURVWLQJ
The indoor fan is stopped although the graphic
indication is unchanged.
The louver is
¿ xed at the horizontal position.
The graphic louver symbol on the LCD remains
animated.
‡2SHUDWLRQ6WRSSDJHGXULQJ'HIURVWLQJ2SHUDWLRQ
The RUN LED (Green) goes out when the
operation is stopped during defrosting.
+RZHYHUWKHRSHUDWLRQFRQWLQXHVZLWKWKH³‡´
displayed, and the unit stops after the
defrost operation is
¿ nished.
6.1.4 Operation Control
‡6XSSO\LQJ(OHFWULFDO3RZHU
7KH³‡´LVDFWLYDWHGZKHQHOHFWULFDOSRZHULV
turned ON.
In this case, the compressor is now in the
preheat stage. Operation might be delayed by a
maximum of four hours. Do not cut power to the
outdoor unit during seasonal heating and cooling
operation.
‡'XULQJ+HDWLQJ2SHUDWLRQ2QO\
7KH³‡´LVWXUQHG21
‡'LIIHUHQW2SHUDWLRQ0RGH
The operation mode set by the controller is
different from the outdoor unit operation mode.
(Except for the heat recovery system models.)
The operation mode indicator will À ash.
This indicator will À ash when a
command to COOL has been set by
way of the controller during a HEATING
operation.
6.1.1 Central Control
The “ ” means turned ON.
In case that the prohibiting operation by controller
is set from the central controller, operation,
temperature setting, fan speed and direction
setting are not available from the controller.
Turned ON
Turned ON
Turned ON
Turned ON
Flashing
2-170
Service Manual
OPERATION